On Wed, 26 Mar 2025, Peter Zijlstra wrote: > On Wed, Mar 26, 2025 at 03:37:50PM +0100, Miroslav Benes wrote: > > > If I remember correctly, we had something like this in the old kGraft > > implementation of the live patching (SUSE way). We exactly had a hook > > somewhere in the kthread freezing code. This looks much cleaner and as far > > as I know the fridge went through improvements recently. > > Yeah, I rewrote it a while ago :-)
Right :) > > Peter, so that I understand it correctly... we would rely on all kthreads > > becoming freezable eventually so that both suspend and livepatch benefit. > > Is that what you meant by the above? > > Well, IIRC (its been a while already) all kthreads should have a > FREEZABLE already. Things like suspend-to-idle don't hit the hotplug > path at all anymore and everything must freeze, otherwise they fail. Good. > I was more meaning the time-to-freeze; if some kthreads take a long time > to freeze/patch then this would want improving on both ends. Makes sense. So I am all for the patch. See my comment elsewhere though. Miroslav
